In salt-cloud for ubuntu 22.04 bad entry for netplan

[shadoutmapes]

Description of Issue/Question

Script still puts default gateway in the netplan config yaml as GATEWAY4:"default gw" Ubuntu has deprecated this and the new way is to use the routes statement. I believe this is backwards compatible and could be change for all netplan based distros.

Setup

(Please provide relevant configs (Be sure to remove sensitive info).) Basic in any normal deployment of ubuntu 22.04 and on.

Steps to Reproduce Issue

(Include debug logs if possible, bootstrap-salt.sh -D.)

Versions and Systems

(salt --versions-report, bootstrap-salt.sh -v, system type and version, cloud/VM provider as appropriate.)